Drum construction for concrete-mixing machines and the like.



A. D. MOSBY. DRUM CONSTRUCTION FOR CONCRETE MIXING MACHINES AND THE LIKE.

APPLICATION FILED MAY 8, 1913.

, COLUMBIA PLANOQRAPI-I c0.. WASHINGTON, D. c.

ooaeeo.

ALFRED D. MOSBY, OF CHICAGO, ILLINOIS,

FEW.

ASSIGNOR TO MARSH-CAPRON MANUFAC- TURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DRUM CONSTRUCTION FOR CONCRETE-MIXING MACHINES AND THE LIKE.

Patented May 12, 1914.

Original application filed February 23, 1911, Serial No, 610,154. Divided and this application filed May 8,

To all whom it may concern:

Be it known that I, ALFRED D. MoseY, a citizen of t-he'United States, residing at Chi cago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Drum Constructions for Concrete-Mixing Machines and the like, of which the following is a specification.

.My invention relates to concrete mixing machines of the revoluble drum type, and the invention has for its object to provide a novel drum construct-ion having certain improved features to be hereinafter described and claimed.

One of these improvements relates particularly to the driving gear or circular toothed rack on the drum, by means of which the drum is rotated, and to the means employed for securing said gear or rack to the drum. The gear is made in'segments which are separately and detachably secured to the drum in such manner that the removal of one segment does not necessitate the removal of any other segment or other part of the drum, or necessitate the dismounting of the drum from its rollers. By making the gear of a number of separate segments and by securing the segments separately to the drum, if a tooth of the gear is broken it is necessary to replace only the damaged segment. Thus a saving is effected both of money and of time. 7

As a further improvement the drum is made in separate sections and these sections secured together bythe same devices used for attaching the gear segments to the drum. As a general rule only a single segment need be removed at a time. hen this is done the bolts securing the other segments sufiice to hold the drum sections together. There is, therefore, a peculiar relation between the sectional construction of the drum and the sectional construction of the gear.

Another improvement consists in the configuration given to the lips at the filling and. discharge openings in the sides of the drum. These lips are so formed as to prevent, or very largely prevent, the wet mixture from dripping or from being thrown or splashed out of the openings when the drum is revolved. If the wet cementitious and gritty mixture is allowed to come into contact with the gears supporting the rollers or other moving parts of the driving apparatus it Serial No. 766,330.

soon causes these parts to wear out besides clogging the machine.

My invention provides a construction which checks the slopping of the wet mixture from the drum openings to a very large degree.

A further object of the invention is to provide rollers on which the drum is mounted, the bearings of which are suitably housed so as to be protected from dirt, grit, cement and the like.

The invention is illustrated, in a preferred embodiment, in the accompanying drawing, wherein Figure 1 is an elevation of the drum with certain parts shown in section; Fig. 2 a sectional View taken on line 22 of Fig. 1, looking in the direction of the arrows; Fig. 3 a view of one of the gear segments; and Fig. 4 a sectional plan illustrating the construction of the rollers supporting the drum.

Like characters of reference designate like parts in the several figures of the drawing.

The drum shown in the drawing is made up of two castings or sect-ions 1O, 11 rabbeted at their meeting edges and, formed with the circumferential ribs or projections 12. The gear or rack is made up of a number of segments 13 provided with tongues 14, preferably'formed with the finishing pads 15. These consist of slight projections or lugs formed on the sides of the tongues and are provided so that the entire side surfaces of the tongues do not have to 'be-machined. The tongues of the gear segments fit into the channel orseat formed by the ribs 12. Bolts 16, arranged at suitable intervals, extend through the ribs 12 and the tongues 14 so as to bind together the drum sections and at the same time secure the gear segments thereto. By this arrangement if one of the teeth of the gear becomes injured or broken it is only necessary to replace a single segment. Furthermore, this can be effected without dismounting the drum from its rollers. It is only necessary to remove the bolts which secure the segment in question.

The drum is provided preferably with the circular tires or tracks 18 and the drum is revoluloly supported on suitable rollers indicated by the dotted line figures 19. I make no claim to this feature of the drum construction. The interior of the drum may be furnished with any suitable mixing devices such as the obliquely arranged blades 20 and the buckets 21.

The drum is formed on each side with a circular opening, the ingredients of the concrete being fed into the drum through the opening on one side and the mixed concrete discharged through the opening on the other side. The mixture in the drum is often a semi-fluid mixture consisting of water, ce ment, sand and the like. This mixture is very likely to drip out of the drum openings in machines of this general sort as the drum is revolved, and by following around the outside of the drum get in between the tracks and the bearing rollers or into other parts of the driving mechanism causing these parts to wear rapidly and furthermore clogging the running of the machine. To prevent this as far as possible I give the metal of the drum around the openings the configuration best shown at the right hand side of Fig. 1. The side of the drum is depressed or inclined inwardly as indicated at a and a flange b is provided which projects outwardly and is tapered outwardly, this flange terminating in a flaring rim 0. As the drum turns over any of the mixture which is at the side of the drum near the opening as it falls from the wall of the drum is carried inwardly away from the opening by the inclined surface a. If any of the material reaches the neck flange b the inclination or taper of this part tends to throw the material back into the drum. If the slop goes over the neck flange Z; the rim part c carries it out far enough beyond the outer surface of the drum so that it is likely to drop off onto the ground or onto the carriage supporting the mixer rather than follow the circuitous course to the drum which is providedby the angular lip b, c.

Fig. 4: shows one of the rollers 19 supporting the drum and the means for protecting the bearing from cement, dirt, grit and the like. 22 designates the shaft on which the roller is mounted, anti-friction rolls 23 being preferably employed. The roller 19 has hubs 2 1 and sleeves 25, 26 are provided having enlargements 27 which bear on these hubs. The sleeves are secured to the shaft by set screws 28 so that they position the roller 19. The end of shaft 22 is notched and held from turning by plates 29 bolted to the frame 30 of the machine.

This application is a division of my application Serial No. 610,154- filed February 23, 1911.

I claim:

1. In a concrete mixing machine, the combination with a mixing drum formed with a pair of circular ribs spaced apart and forming a groove between them, of a drive gear made up of a plurality of segments each formed with a tongue adapted to fit into the groove between the ribs on the drum, and means for separately and detachably securing said segments to said ribs.

2. In a concrete mixing machine, the combination with a mixing drum comprising drum sections formed adjacent their meeting edges with projecting ribs, of a drive gear made up of a plurality of segments each formed with a tongue adapted to fit between the ribs on said drum sections and bolts extending through said ribs and through said tongues so as to secure the drum sections together and at the same time secure the gear segments thereto.

3. A revoluble drum for a concrete mix ing machine having an opening in one side, the side wall of which drum around said opening is formed with an inturned portion projecting into the drum and a flange outwardly projecting therefrom having a slope toward the axis of the drum and provided with an angularly disposed flaring iron.

ALFRED D. MO SBY.

WVitnesses:

L. A. FALKENBERG, R. G. Trrornson.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Iatents, Washington, D. 0. 

